A block having mass m travels along a horizontal frictionless surface with speed v. What is the smallest amount of work that must be done on the block to reverse its direction?
1.–mv²
2.–½mv²
3.0
4.½mv²
5.mv²
6.None of the above
7.Cannot be determined
3
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Which of the following expands most when temperature is increased?
1) iron 2) ice water 3) helium 4) all expand the same Which of the following expands most when temperature is decreased? 5) iron 6) ice water 7) helium 8) all expand the same
Some massive stars only live a few million years
Indicate whether the statement is true or false
Dust and gas in the Milky Way
A. are concentrated in a thin layer in the disk. B. are found in different places: dust primarily in the disk and gas primarily in the halo. C. are spread evenly throughout the halo and disk. D. are found in different places: gas primarily in the disk and dust primarily in the halo.
Which of the following statements is true?
A. All the photons of the Lyman series are in the ultraviolet. B. Some of the photons of the Lyman series are in the visible. C. Some of the photons of the Lyman series are in the infrared. D. All of the Balmer series are in the visible. E. All of these statements are false.